Inventor · disambiguated record
Christian Lettmann
Also filed as: LETTMANN CHRISTIAN
11 granted patents·6 pending applications·103 citations·filing 2001–2012
89Inventor score
Top patents by PatentIndex Score
17 records- 0193US8378127B2Method for producing 2,6-dioxabicyclo-(3.3.0)-octane-4,8-dioneEVONIK DEGUSSA GMBH·Filed 2010·Granted Feb 19, 2013·21 cites·15 claims
- 0290US6924385B2Method for synthesis of aliphatic isocyanates from aromatic isocyanatesDEGUSSA·Filed 2002·Granted Aug 2, 2005·23 cites·44 claims
- 0387US6437186B1Process for the preparation of 3-aminomethyl-3,5,5-trimethylcyclohexylamineDEGUSSA·Filed 2001·Granted Aug 20, 2002·20 cites·21 claims
- 0485US7091384B2Process for increasing the selectivity of the hydrogenation of 4,4′-diaminodiphenylmethane to 4,4′-diaminodicyclohexylmethane in the presence of an N-alkyl-4,4′-diaminodiphenylmethaneDEGUSSA·Filed 2003·Granted Aug 15, 2006·18 cites·10 claims
- 0584US9085506B2Process for preparing 3-aminomethyl-3,5,5-trimethylcyclohexylamineGALLE MARKUS·Filed 2011·Granted Jul 21, 2015·8 cites·65 claims
- 0676US8877976B2Process for preparing 3-aminomethyl-3,5,5-trimethylcyclohexylamineLETTMANN CHRISTIAN·Filed 2011·Granted Nov 4, 2014·3 cites·24 claims
- 0776US8536370B2Low chlorine, multi-staged method for producing cycloaliphatic disocyanatesGRUND GERDA·Filed 2009·Granted Sep 17, 2013·3 cites·45 claims
- 0858US7052914B2Automated method for examining catalytic and spectroscopic properties of the components of combinatorial librariesHTE AG THE HIGH THROUGHPUT EXP·Filed 2001·Granted May 30, 2006·7 cites·15 claims
- 0950US2009198024A1Formaldehyde-free, carbonyl- and ring-hydrogenated ketone-aldehyde resins based on alkyl aryl ketones and formaldehyde which have a low oh functionality and a process for preparing themEVONIK DEGUSSA GMBH·Filed 2007·Application pending·0 cites
- 1050US2009099332A1Formaldehyde-free, oh-functional, carbonyl- and ring-hydrogenated ketone-aldehyde resins based on alkyl aryl ketones and formaldehyde and a process for preparing themEVONIK DEGUSSA GMBH·Filed 2007·Application pending·0 cites
- 1149US2009012245A1Carbonyl hydrogenated ketone aldehyde resins, devoid of formaldehyde, based on formaldehyde and associated production methodEVONIK DEGUSSA GMBH·Filed 2006·Application pending·0 cites
- 1247US8003826B2Method for production of trimethylhexamethylenediamineEVONIK DEGUSSA GMBH·Filed 2008·Granted Aug 23, 2011·0 cites·24 claims
- 1345US2013118128A1Composite film and packaging produced therefromLUECKE ANDREAS·Filed 2012·Application pending·0 cites
- 1444US9029412B2Method for preparing diamino-dianhydro-dideoxyhexitols, particularly preferably 2,5-diamino-1,4:3,6-dianhydro-2,5-dideoxy-D-hexitolSTREUKENS GUIDO·Filed 2011·Granted May 12, 2015·0 cites·1 claims
- 1542US2010041921A1Process for preparing 3-aminomethyl-3,5,5-trimethylcyclohexylamineEVONIK DEGUSSA GMBH·Filed 2008·Application pending·0 cites
- 1637US2009048466A1Process for preparing amines by conditioning the catalyst with ammoniaEVONIK DEGUSSA GMBH·Filed 2006·Application pending·0 cites
- 1736US6809215B2Method for hydrogenation of aromatic urethanes in the presence of a supported ruthenium catalystDEGUSSA·Filed 2002·Granted Oct 26, 2004·0 cites·20 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →